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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities:      
Unrealized holdings losses, pre-tax amount $ 13,646 $ (172,699) $ (38,832)
Unrealized holdings losses, tax (expense) benefit (2,932) 37,131 8,349
Unrealized holdings losses, after-tax amount 10,714 (135,568) (30,483)
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, before tax (6,781) (5,715) 0
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, tax 1,458 1,229 0
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, after tax (5,323) (4,486) 0
Less: reclassification adjustment for realized losses, pre-tax amount (10,310) (912) 0
Less: reclassification adjustment for realized losses, tax (expense) benefit 2,217 196 0
Less: reclassification adjustment for realized losses, after-tax amount (8,093) (716) 0
Net unrealized losses, pre-tax amount 30,737 (166,072) (38,832)
Net unrealized losses, tax (expense) benefit (6,607) 35,706 8,349
Net unrealized losses, after-tax amount 24,130 (130,366) (30,483)
Cash Flow Hedges:      
Net increase in fair value, pre-tax amount 179 10,038 2,987
Net increase in fair value, tax (expense) benefit (38) (2,158) (642)
Net increase in fair value, after-tax amount 141 7,880 2,345
Net increase in fair value, pre-tax amount 261 9,770 3,627
Net increase in fair value, tax (expense) benefit (56) (2,100) (780)
Net increase in fair value, after-tax amount 205 7,670 2,847
Postretirement Plans:      
Net actuarial loss, pre-tax amount 114 2,859 (20)
Net actuarial loss, tax (expense) benefit (25) (614) 4
Net actuarial loss, after-tax amount 89 2,245 (16)
Less: Amortization of net actuarial losses, pre-tax amount 3 (947) (894)
Less: Amortization of net actuarial losses, tax (expense) benefit (1) 203 192
Less: Amortization of net prior service credits, after-tax amount 2 (744) (702)
Less: Amortization of net prior service credits, pre-tax amount 24 24 24
Less: Amortization of net prior service credits, tax (expense) benefit (5) (5) (5)
Less: Amortization of net prior service credits, after-tax amount 19 19 19
Net loss on postretirement plans, pre-tax amount 87 3,782 850
Net loss on postretirement plans, tax (expense) benefit (19) (812) (183)
Net (loss) gain on postretirement plans, net of tax 68 2,970 667
Other comprehensive income, pre-tax amount 31,085 (152,520) (34,355)
Other comprehensive income, tax (expense) benefit (6,682) 32,794 7,386
Other comprehensive income (loss) 24,403 (119,726) (26,969)
Interest Expense, Borrowings and Subordinated Debentures      
Cash Flow Hedges:      
Less: effective portion reclassified into interest expense, pre-tax amount 3,364 263 (2,254)
Less: effective portion reclassified into interest expense, tax (expense) benefit (723) (57) 485
Less: effective portion reclassified into interest expense, after-tax amount 2,641 206 (1,769)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Less: effective portion reclassified into interest expense, pre-tax amount 3,364 263 (2,254)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax 723 57 (485)
Less: Amounts reclassified from AOCI 2,641 206 (1,769)
Interest Income, Interest and Fees on Loans      
Cash Flow Hedges:      
Less: effective portion reclassified into interest expense, pre-tax amount (3,446) 5 1,614
Less: effective portion reclassified into interest expense, tax (expense) benefit 741 (1) (347)
Less: effective portion reclassified into interest expense, after-tax amount (2,705) 4 1,267
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Less: effective portion reclassified into interest expense, pre-tax amount (3,446) 5 1,614
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax (741) 1 347
Less: Amounts reclassified from AOCI $ (2,705) $ 4 $ 1,267